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New energy-preserving schemes for Klein-Gordon-Schroedinger equations

机译:Klein-Gordon-Schroedinger方程的新节能方案

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摘要

In this manuscript, we focus on new conservative numerical methods for Klein-Gordon-Schroedinger equations. By expressing Klein-Gordon-Schroedinger equations in an infinite-dimensional Hamiltonian form, we firstly discretize spatial derivatives by using Sinc collocation method then approximate the associated semi-discrete ordinary differential equations by discrete gradient method. Based on two different discrete gradients, two new energy-preserving schemes are provided, respectively. Furthermore, it is proved that both schemes preserve the discrete charge conservation law as well. Finally, numerical experiments are presented to show the excellent long-time conservation behavior and efficiency of the new energy-preserving schemes.
机译:在本手稿中,我们重点介绍Klein-Gordon-Schroedinger方程的新保守数值方法。通过用无限维哈密顿量形式表示Klein-Gordon-Schroedinger方程,我们首先使用Sinc搭配方法离散化空间导数,然后通过离散梯度法近似关联的半离散常微分方程。基于两个不同的离散梯度,分别提供了两种新的节能方案。此外,证明了两种方案也都保留了离散电荷守恒律。最后,数值实验表明新的节能方案具有优异的长期节能性能和效率。

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